It sort of turns an opaque color. Like the difference between clear and white is as best I can describe it. It just takes a few minutes.
ETA: what you're really after is to bring the nutty flavour out of the rice. As long as you don't burn it you're good.
ETA: what you're really after is to bring the nutty flavour out of the rice. As long as you don't burn it you're good.